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    <title>Document</title>
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    <table border="1">
        <caption>学生成绩单</caption>
        <thead>
          <tr>
            <th>姓名</th><th>性别</th><th>成绩</th>
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         <tfoot>
          <tr>
            <td>平均分</td><td colspan="2">540</td>
          </tr>
        </tfoot>
        <tbody>
          <tr>
            <td>张三</td><td>男</td><td>560</td>
          </tr>
          <tr>
            <td>李四</td><td>男</td><td>520</td>
          </tr>
          <tr>
            <td>王五</td><td>男</td><td>540</td>
          </tr>
        </tbody>
      </table>


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      <table border="2" width="200px">
        <tr>
            <td width="25%" colspan="4">11</td>
            
        </tr>
        <tr>
            <td width="25%">21</td>
            <td width="25%">22</td>
            <td width="25%">23</td>
            <td width="25%">24</td>
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        <tr>
            <td width="25%" rowspan="2">31</td>
            <td width="25%">32</td>
            <td width="25%">33</td>
            <td width="25%">34</td>
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        <tr>
            <td width="25%">41</td>
            <td width="25%" rowspan="3">42</td>
            <td width="25%">43</td>
            
        </tr>
        <tr>
            <td width="25%" colspan="2">51</td>
            <td width="25%">52</td>
           
            
        </tr>
        <tr>
            <td width="25%">61</td>
            <td width="25%">62</td>
            <td width="25%">63</td>
            
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